Fig. 1. Plastic Balloon for Constant Level Balloon Project... 4
Fig. 2. Thin, tear-drop, polyethylene balloon... 5
Fig. 3. General Mills twenty-foot balloon... 5
Fig. 4. Ten-foot appendix attached to a General Mills balloon... 5
Fig. 5. Two-foot appendix, stiffened, shown on a General Mills
balloon... 5
Fig. 6. General Mills twenty-foot balloon in flight... 5
Fig. 7. Idealized time-altitude curves for various balloon
control systems... 7
Fig. 8. Manual ballast valve... 7
Fig. 9. Components of Manual Ballast release assembly... 7
Fig. 10. Manual ballast release assembly... 7
Fig. 11. Automatic ballast valve... 7
Fig. 12. Automatic ballast valve, showing loaded diaphragm... 7
Fig. 13. Automatic ballast valve... 7
Fig. 14. Minimum Pressure switch... 8
Fig. 15. Ballast reservoir... 10
Fig. 16. Ballast release assembly... 10
Fig. 17. Complete ballast release assembly... 10
Fig. 18. Coverage of probable balloon paths with four-station.
SCR-658 net... 12
Fig. 19. Buoyancy vs. altitude for various diameter balloons
(helium)... 17
Fig. 20. Buoyancy vs. altitude for various diameter balloons
(hydrogen)... 17
Fig. 21. Calculated net lift for General Mills Inc., balloons... 18